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Characterizing extreme drought and wetness in Guangdong, China using global navigation satellite system and precipitation data
Springer Science and Business Media LLC - Tập 5 - Trang 1-17 - 2024
Hai Zhu, Kejie Chen, Haishan Chai, Yuanbin Ye, Wenjian Liu
As global temperature rises, the frequency of extreme climate events, e.g., severe droughts and floods, has increased significantly and caused severe damage over the past years. To this regard, precipitation efficiency, a crucial meteorological parameter, could provide valuable insights for a better understanding of the patterns and characteristics of these extreme events. In this study, taking Gu...... hiện toàn bộ
PPP–RTK functional models formulated with undifferenced and uncombined GNSS observations
Springer Science and Business Media LLC - Tập 3 - Trang 1-15 - 2022
Baocheng Zhang, Pengyu Hou, Jiuping Zha, Teng Liu
Technique PPP–RTK combines the advantages of both the Precise Point Positioning (PPP) and the Real-Time Kinematic (RTK) positioning. With the emergence of multi-frequency Global Navigation Satellite System (GNSS) observations, it is preferable to formulate PPP–RTK functional models based on original (undifferenced and uncombined) observations. While there exist many variants of the undifferenced a...... hiện toàn bộ
Wind speed retrieval using GNSS-R technique with geographic partitioning
Springer Science and Business Media LLC - Tập 4 - Trang 1-15 - 2023
Zheng Li, Fei Guo, Fade Chen, Zhiyu Zhang, Xiaohong Zhang
In this paper, the effect of geographical location on Cyclone Global Navigation Satellite System (CYGNSS) observables is demonstrated for the first time. It is found that the observables corresponding to the same wind speed vary with geographic location regularly. Although latitude and longitude information is included in the conventional method, it cannot effectively reduce the errors caused by g...... hiện toàn bộ
Modeling and assessment of five-frequency BDS precise point positioning
Springer Science and Business Media LLC - Tập 3 - Trang 1-14 - 2022
Zhiyuan Wu, Qianxin Wang, Chao Hu, Zhihao Yu, Wei Wu
Since its full operation in 2020, BeiDou Satellite Navigation System (BDS) has provided global services with highly precise Positioning, Navigation, and Timing (PNT) as well as unique short-message communication. More and more academics focus on multi-frequency Precise Point Positioning (PPP) models, but few on BDS five-frequency PPP models. Therefore, this study using the uncombined and Ionospher...... hiện toàn bộ
A multipath mitigation algorithm for GNSS signals based on the steepest descent approach
Springer Science and Business Media LLC - Tập 3 - Trang 1-11 - 2022
Wenqi Qiu, Qinghua Zeng, Rui Xu, Jianye Liu, Jinheng Shi, Qian Meng
Multipath interference seriously degrades the performance of Global Navigation Satellite System (GNSS) positioning in an urban canyon. Most current multipath mitigation algorithms suffer from heavy computational load or need external assistance. We propose a multipath mitigation algorithm based on the steepest descent approach, which has the merits of less computational load and no need for extern...... hiện toàn bộ
Sản phẩm và dịch vụ Multi-GNSS tại Trung tâm Ứng dụng Đổi mới iGMAS Vũ Hán: chiến lược và đánh giá Dịch bởi AI
Springer Science and Business Media LLC - Tập 3 Số 1
Xingxing Li, Qingyun Wang, Jiaqi Wu, Yongqiang Yuan, Yun Xiong, Xuewen Gong, Zhilu Wu
Tóm tắtTrong những năm qua, Hệ thống Giám sát và Đánh giá Hệ thống Định vị Toàn cầu Quốc tế (GNSS) iGMAS Trung tâm Ứng dụng Đổi mới Vũ Hán (IAC) đã dành riêng cho việc khám phá tiềm năng của các tín hiệu multi-GNSS và cung cấp một tập hợp các sản phẩm và dịch vụ. Đóng góp này tóm tắt các chiến lược, thành tựu và đổi mới trong việc xác định quỹ đạo/đồng hồ/thiên lệc...... hiện toàn bộ
Distributed Kalman filter for UWB/INS integrated pedestrian localization under colored measurement noise
Springer Science and Business Media LLC - Tập 2 - Trang 1-10 - 2021
Yuan Xu, Jing Cao, Yuriy S. Shmaliy, Yuan Zhuang
Colored Measurement Noise (CMN) has a great impact on the accuracy of human localization in indoor environments with Inertial Navigation System (INS) integrated with Ultra Wide Band (UWB). To mitigate its influence, a distributed Kalman Filter (dKF) is developed for Gauss–Markov CMN with switching Colouredness Factor Matrix (CFM). In the proposed scheme, a data fusion filter employs the difference...... hiện toàn bộ
A new inter-system double-difference RTK model applicable to both overlapping and non-overlapping signal frequencies
Springer Science and Business Media LLC - Tập 4 - Trang 1-10 - 2023
Wenhao Zhao, Genyou Liu, Ming Gao, Bo Zhang, Shengjun Hu, Minghui Lyu
Aiming at the problem that the traditional inter-system double-difference model is not suitable for non-overlapping signal frequencies, we propose a new inter-system double-difference model with single difference ambiguity estimation, which can be applied for both overlapping and non-overlapping signal frequencies. The single difference ambiguities of all satellites and Differential Inter-System B...... hiện toàn bộ
A review of real-time multi-GNSS precise orbit determination based on the filter method
Springer Science and Business Media LLC - Tập 3 Số 1 - 2022
Yidong Lou, Xiaolei Dai, Xiaopeng Gong, Chenglong Li, Yun Qing, Yang Liu, Yunfeng Peng, Shengfeng Gu
AbstractStable and reliable high-precision satellite orbit products are the prerequisites for the positioning services with high performance. In general, the positioning accuracy depends strongly on the quality of satellite orbit and clock products, especially for absolute positioning modes, such as Precise Point Positioning (PPP). With the development of real-time...... hiện toàn bộ
Estimation of BDS pseudorange biases with high temporal resolution: feasibility, affecting factors, and necessity
Springer Science and Business Media LLC - - 2023
Ke Su, Guoqiang Jiao
AbstractA common practice adopted for the pseudorange bias estimation and calibration assumes that Global Navigation Satellite System satellite-dependent pseudorange biases vary gently over time. Whereupon satellite pseudorange biases are routinely estimated and provided as the products with low temporal resolution, e.g., hourly or daily, by the agencies. The story...... hiện toàn bộ
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